One vertex per element, one color per generator, with an edge from x to x·s.
(2,3)(11,13)(12,15)(17,18)(19,20)(21,24)(22,23)(25,28)(26,27)(29,32)(30,31) involution — undirected(6,8)(9,10,14,16)(11,15,13,12)(18,23)(19,25)(24,31)(26,32)(1,2,4,3)(5,6)(7,8)(9,11,14,13)(10,15,16,12)(17,19,22,25)(18,20,23,28)(21,26,30,32)(24,27,31,29)(9,12)(10,11)(13,16)(14,15)(17,20)(18,19)(21,29)(22,28)(23,25)(24,32)(26,31)(27,30) involution — undirected(1,3,4,2)(9,13,14,11)(10,12,16,15)(17,21)(18,24)(19,26)(20,27)(22,30)(23,31)(25,32)(28,29)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.